Rotary pump.



A. A. BOWSER.

RGTARY PUMP.

"Pue/mon msn Anaal. 19u.

1 1 82,967 Patented 'May 16, 1916.

IMM!" la J i 2@ A K @/r d I. "i" i H (4 f 5 M um A. A. BOWSER.'

RGTARY PUMP.

Mmc/mon mtu ausm. 19u.

Patented May16,^1916.

2 SHEETS--SHEU 2 ALLEN L BOWSEB, 0F FORT WAYNE, INI-)IANAi ROTARY PUMP.

Specification of Letters Patent.

Patented May 16, 1916.

Application filed August 31,1914. Serial No. 858,554.

To all whom it may concern:

Be it known that I, ALLEN A. Bowser., a citizen of the United States, residing at Fort Wayne, in the .county of Allen and State pf Indiana, have invented certain new and useful Improvements in Rotary Pumps, of which the following is a specification.

This invention relates to a motor or pump 'comprising rotary members having teeth and recesses which coperate with each other to form either a pump for liquids or a motor actuated by Huid under pressure. It may also be used as a meter for measur ing the fluid passing through it and is so described in the present case, having a register actuating shaft in connection with it.

The principal object of the invention is .to'provide a pump or motor .of this class which is simple in construction but eilective and efficient in operation. v

Among the objects of the invention are to provide a device of this class in which there is no dead center; to provide construction of two similar rotors movable in two similar bores with the minimum rfriction contact; and to provide a construction of this class in which there is no packing of the liquid by providing coperating teeth I, in which there is always a passage from the contact surfaces thereof to the discharge side, thereby preventing back contact of the 'teeth and forming a noiseless construction.

companying drawings and described in the specifications, but more particularly pointed out in the appended claims.

EIn'thc accompanying drawings, Figure 1 is a sectional view Aof a motor constructed in accordance with the principles of my invention; Fig. 2 is a sectional View taken on the line 2-2 of Fig. 1; Fig. 3 is a sectional vview taken on the line 3-3of Fig. 2; Fig. 4 is a sectional View of a modified form of motor, and Fig. 5 is a sectional view of the modified form taken on the line 5 5 of Fic'. 4. l

ne of the principal objections 4to fluid operated motors is that the-teeth pack as the rotors are operated. By pack is f; meant the pocketing of the liquid by AOne of the teeth in the correspondinv Uroove or depression of the other rotor so thatv as both of the rotors rotate some of the liquid will be carried backward to the inlet side and this packing of the liquid by the teeth will not only cause the bearings of the rotors to become unduly worn, but also by the contact of the back of each tooth with its corresponding recess, will cause considerable noise and the maximum friction. Also the accuracy of the motor as a meter is impaired because of the fact that a certain quantity of the liquid which is packed will be ycarried from the exhaust side of the rotors to the inlet side.

By forming the teeth and the recesses of the rotors so that there will be a line of contact on one side of each tooth with va free passage therefrom to the discharge side, the friction and noise are eliminated, there is no packing, and a fluid tight conl nection is made which is subject to less variation, leaking and backward movement of the Huid which acts upon the motor.

Referring more particularly to the drawings, a pair of rotors 7 and 8 are mounted upon shafts 9 and 10 respectively in a casing l1. A supplementary casing l2 is adapted to be secured to the casing 11 and `inserted between the two casings is a plate 13 which confines the rotors in a chamber in the main casing 11 so that they fit closely therein. The plate 13 has an opening 14 at v one side through which communication is made between the casings 11 and 12 through the chamber containing the rotors. The plate 13 is also provided withan opening 15 which makes communication between the casing 12 and a discharge passage 16 which, as seen in Fig. 2, has an outlet or discharge opening 17 at each end of the passage 16. An intake opening 18 is substantially in the same plane as the discharge openings and communicates with the chamber containing the rotors at one side thereof. The plate 13 forms a support for one end of both of the shafts 9 and 10 and is provided with hearings 19 through which the shafts pass. The other ends of the shafts 9 and 10 are mounted in bearings 2() seated in suitable recesses in the casing and accessible through openings therein in which are plugs 21.

Each rotor is formed with recesses 22 and 'teeth 23. Each tooth has a rounding forward contact face 24, acutawa back face 25 and a curved extremity 26 which fits closely a circular recess Of the .Casing in which the loo rotor is operated. Each recess 22 is formed with a rounding contact face 27 and with a cutaway hack face '28. Each tooth is adapted to make Contact with the corresponding front face of the recess leaving a space around the tip of the tooth to the discharge side thereof. -Each tooth and its recess are -3 undue Wearing of the rotor pivots. IEach rotorvis secured to a shaft by 'means of a pin Q9 extending through it and the shaft, or in any other suitable manner.

As shown in Fig. B, the liquid enters the casing 11 through the opening 184 and by the pressure of the liquid the rotors are rotated in the direction of the arrows in Fig. 2, yso that a certain amount of liquid is carried by the rotors from the inlet to the discharge side thereof and romthe discharge -side of the rotors theuid is directed through lthe .opening 14 of the platerl to the discharge @Perline As before explained, the rotors lit their respective parts of the casing closely .and they contact on their pitch lines making a fluid tight connection. y With this construction there can be no dead center' for Ieven though one of the rotors should reach such a. position Vthat it would be balanced by ,the incoming fluid the tooth of the other rotor, being further from its own tenter than the groove which receives the same pressure, would cause a rotation of the other rotor causing continuous rotation ,of lroth of the rotors.

In order to keep the rotors in exact alinef menteuch of the shafts 9 and l0 is provided with a gear il() disposed in the casing l? the teeth of which mesh and have a pitch line the same as the pitch line of the rotors. To one of these gears 30 is secured a worm geared member 3l which in turn secured to one of the shafts il and to the other gear a member 32 secured by means of bolts which extend through lai-gc perforations 3ft and into threaded openings in the-gear 30. The bolts fit loosely in the porforations 34. for the purpose of permitting. a slight adjustment of one of the gears 30 with respect to the other one. The member 32 is of course secured to the shaft l0. B'Ieshing With the worm gear 3l is a gear 3V mounted on a shaft 36 which is for the purpose of driving the meter to which thefmotor is connect'ed.l or for driving :my other device for which the motor is adapted. Opposite the other shaft l0 is a packing gland 37 through Which a shaft extends. At the inner end of the shaft 3S it is formed with s-tooth 39 and 'the adjacent end of the Shaft 10 and the member 32 are provided with a recess correvspending `to the-tooth 3 9 so that by their engagement as the shaft 38 is rotated in one direction the rotors may be rotated. For this purpose a crankor handle 41 is secured at -the outer end of the shaft 38 and --the `purpose,ofthisconstruction Vis to permit the the teeth make very olosecontact with their A corresponding grooves and the means tor 35 the adjustmentiofthe .gears y30 with respect to each other is very essential.

Iii-the modification shown 'by Figs. A: and 5, ,a single ,casing V42 is ,provided .inviwhich ILOGOISS and vS9 are movable ,in the .manner 43r secured directly to :.the rotors'nnd mounted in the same chamber with them. A

seats one ,end of .the shafts 45 $1111.46 upon which the rotors are mounted, .the ,other ends Of .the Shafts hengfs'eated in the `,casing and one 0f the sha-its 45 provided with a ,Worm 47 meshing directly with the gear 48 mounted upon a shaft 4:9 corresponding to the shaft 36 inthe other form of motor. In Athis modified form there is an inlet 50 at one side ofthe ,casing withenoutlet 5131: the other end of the casing.

Since there is no ,leakage in a motor of this kind, .0r so little leakage that it may be neglected, each rotation of the rotors'is a measure of a certain quantity ,of liquid and if a counter is attached to one of Vthe rotors it will record the passage of a rtain amount of liquid through the motor.

'Vhat I claim is:

l. In a rotary motor, the'combination o rotors each formed with teeth and correspending recesses and each tooth being formed to contact with one side of the corresponding recess of the other rotor and t0 leave a free path in the recess around the end of the tooth, shafts upon which the rotors are mounted, and means to engage the rotors with each other, said means'comprising a slotted blade memberl fixed to one shaft, another member loose on the shaft and a fastening holt threaded in thememloer through the slot' to vary the position of one of the members with respect to the other to hold each tooth in Contact With the side of its corresponding recess.

2. in a rotary motor, the combination with parallel rotatable shafts, of rotors yzo mounted thereon, each comprising teeth and coperating recesses, gears having pitch lmes corresponding to the rotors, means for securing one of the gears directly to one of the shafts, a slotted blade fixed to the l other shaft, and loose-fitting bolts threaded into the other ear through the slots of the blades for a justably connect ing the other gear to the other shaft whereby the position of one rotor ma be varied with respect to the other to ta e'up wear and to maintain the front of each tooth in Contact with the front end of its corresponding recess.

3. In a motor of the class described the combination with a casing having a chaxnber with circular walls, an inlet communicaing with said chamber and having a discharge passage partitioned from said chamber, of an auxiliary casing, a late between the casings with an aperture ormin communication between the interiors of t e two casings and another aperture forming communication between the auxiliary casing and the discharge passa e in the other casing, and coperating toot ed rotors mounted in the chamber of the first casing and ro tated by the passage of fluid from the inlet to the discharge openings.

4. In a motor of the class described., the

combination with: a casing having aninlet and an outlet, of rotors each formed with teeth and corresponding recesses, each tooth and recess being formed so that the tooth engages one sidel of the recess only, shafts in the casing to which the rotors are secured, a worm and gear connection with one of the shafts, a gear having the same pitch line as one of the rotors fixed to this shaft, a member with perforations fixed to the other shaft, a gear with a pitch line the same as the other rotor meshin with the first named gear and formed wit threaded perforations, and adjustable bolts extending loosely through the perforations in the member on rthe iast named shaft to var the position of the rotor of this shaft wit respect to the gear so that the rotors may be held in engagement and so that the front face of each tooth contacts with the front .face of its corresponding recess.

In testimony whereof I have signed my name to this specification, in the resence of two subscribing witnesses, on t is 17th day of August A. D. 1914.

ALLEN A. BOWSER.

Witnesses:

J R. Mnmox, O. J'. ROHLMAN. 

